forked from boostorg/beast
Vinnie Falco
d81196294f
The concept type traits are renamed for consistency, and consolidated into a single header file <beast/core/type_traits.hpp> A new section, Core Concepts, is added to the documentation describing all of the core utility classes and functions. This also includes a complete explanation and sample program describing how to write asynchronous initiation functions and their associated composed operations.
131 lines
2.7 KiB
C++
131 lines
2.7 KiB
C++
//
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// Copyright (c) 2013-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BEAST_HTTP_STRING_BODY_HPP
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#define BEAST_HTTP_STRING_BODY_HPP
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#include <beast/config.hpp>
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#include <beast/core/error.hpp>
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#include <beast/http/message.hpp>
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#include <beast/core/detail/type_traits.hpp>
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#include <boost/asio/buffer.hpp>
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#include <memory>
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#include <string>
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namespace beast {
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namespace http {
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/** A Body represented by a std::string.
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Meets the requirements of @b Body.
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*/
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struct string_body
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{
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/// The type of the `message::body` member
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using value_type = std::string;
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#if BEAST_DOXYGEN
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private:
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#endif
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class reader
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{
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value_type& body_;
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std::size_t len_ = 0;
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public:
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static bool constexpr is_direct = true;
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using mutable_buffers_type =
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boost::asio::mutable_buffers_1;
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template<bool isRequest, class Fields>
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explicit
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reader(message<isRequest,
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string_body, Fields>& m)
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: body_(m.body)
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{
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}
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void
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init()
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{
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}
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void
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init(std::uint64_t content_length)
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{
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if(content_length >
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(std::numeric_limits<std::size_t>::max)())
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throw std::length_error{
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"Content-Length overflow"};
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body_.reserve(static_cast<
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std::size_t>(content_length));
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}
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mutable_buffers_type
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prepare(std::size_t n)
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{
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body_.resize(len_ + n);
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return {&body_[len_], n};
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}
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void
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commit(std::size_t n)
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{
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if(body_.size() > len_ + n)
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body_.resize(len_ + n);
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len_ = body_.size();
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}
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void
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finish()
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{
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body_.resize(len_);
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}
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};
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class writer
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{
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value_type const& body_;
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public:
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template<bool isRequest, class Fields>
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explicit
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writer(message<
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isRequest, string_body, Fields> const& msg) noexcept
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: body_(msg.body)
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{
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}
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void
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init(error_code& ec) noexcept
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{
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beast::detail::ignore_unused(ec);
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}
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std::uint64_t
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content_length() const noexcept
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{
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return body_.size();
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}
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template<class WriteFunction>
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bool
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write(error_code&, WriteFunction&& wf) noexcept
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{
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wf(boost::asio::buffer(body_));
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return true;
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}
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};
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};
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} // http
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} // beast
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#endif
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